Thanks, David.

I saw some of the websites on cold seeps and mollusks with some of the names you provided. There are some images although none give much idea about size. Are we talking Tridacna gigas or geoducks?

David Kirsh
Durham, NC

*******
Living hydrocarbon seep associated bivalves typically include
bathymodioline mytilids, vesicomyids, and lucinoideans, all of which
are chemosymbiotic.  Some thyasyrids are also chemosymbiotic, as are
solemyoids.  Large clams suggests bathymodiolines or Calyptogena.

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